Disk-sharpener



(No Model.)

H. H. VERNON.

DISK SHARPBNBR.

No.580,168. Patented Apr. 6, 1897.

wmllumnwn 1 lllllllllIllllllllllllllllllll UNITED STATES PATENT O-EETCE.

HENRY H. VERNON, OF PARKER, SOUTH DAKOTA.

DISK-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 580,168, dated April 6,. 1897'. Application filed November 20, 1896. Serial No. 612,892. (No model.)

To (I/ZZ 'wl/,0771, it ntm/ concer/1,:

Be it known that LHENRY ILVERNON, a citizen of the United States, residing at Parker, in the county of Turner and State of South Dakota,have invented anew and useful Disk- Sharpener, of which the following is a specification.

My invention relates to a disk-Sharpener adapted to facilitate the dressing of disks such as are used in connection with harrows, plows, dac.; and the object inview is to provide means for sharpening the disks without detaching them from the spindles to which they are secured, an entire gang being operated upon at one time.

Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended. claims.

In the drawings, Figure l is a perspective view of a disk-Sharpener constructed in accordance with my invention. Fig. 2 is a detail view of the clutch whereby motion is communicated from the drivin g-shaft to the spindle of the gang of disks. Fig. 3 is a detail view of the knife. Fig. 4 is a transverse section of the machine. Fig. 5 is a detail transverse section of the jaws of the sharpening device or knife. Fig. 6 is alongitudinal section of the same.

Similar numerals of reference indicate Corresponding parts in all the figures of the drawings.

1 designates a base, from one end of which rise standards 2, supporting a shaft 3 and suitable driving mechanism. In the construction illustrated this driving mechanism consists of a driving-pinion 4, to the spindle of which is attacheda crank 5,and a gear 6 meshing with said pinion and fixed to the shaft, said gear being of larger diameter than the pinion to multiply the power. Arranged above the base upon uprights 7 rising therefrom are bearings 8, preferably having open upper sides in which the spindle 9 of a gang of disks 10 maybe seated. Any suitable means for holding this spindle against displacement from the bearings may be employed, such, for instance, as retaining-rods 11, loosely connected at one end with the uprights and adapted at their free ends to be. engaged with notches 12 in the opposite uprights. These retaining-rods extend over the upper side of the spindle and secure it in place.

Carried by the shaft 3 is a clutch for engaging one end of the disk-spindle, the same preferably consisting of spaced arms 13, adapted to be arranged upon opposite sides of the terminal nut 14C of said spindle, and having a set-screw 15 to clamp the nut between said arms, whereby rotary motion may be communicated from the shaft to the spindle of the disks.

Arranged parallel with the bearings which are employed for the reception of the diskspindle is a guide 16, supported by uprights 17 and adapted to support a knife 18, which is manually held in operative relation with the edges of thedisk successively. Thisknife consists of a shank provided at one end, at opposite sides, with edges 19, and contiguous to and parallel with the edged portion of the shank is arranged a guard 20, held in place at one end by means of rivets 2l or their equivalents and adjustable at its free end, contiguous to the edges of the knife, by means of a screw 22. The contiguous faces of the shank and guard, at the sharpened portion of the former, are respectively concaved and convexed to insure the proper contact of the edges with the surfaces of the disks when the knife is in use and allow for the curvature of said disks. Y

In operation the gang of disks is arranged upon the frame as above described and connection is made between the spindle thereof and the operating-shaft, after which the knife is grasped, and with its head or edged portion resting upon the guide it is advanced toward the spindle of the disks to arrange the edge of the disk in' the interval between the adjustable guard 2O and the contiguous edged p0rtion of the shank. The object in forming edges at opposite sides of the shank is to enable the knife to be reversed to sharpen the disk upon either face.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the spirit or sacricing any of the advantages of this invention.

IOO

Having described my invention, what I claim is- 1. In a disk-Sharpener, the combination with disk supporting and rotating devices, and a guide arranged parallel with the diskspindle, of a knife having its shank provided with opposite side cutting edges, and an intermediate concave surface, a guard attached to the shank, and spaced from said concave surface, and means for adjusting the guard to var)T the interval between the same and the contiguous edged portion of the shank, substantially as specified.

2. In a disk-Sharpener, the combination with disk supporting and rotating devices, and a guide arranged parallel with the diskspindle, of a knife having its sha-nk provided with cutting edges, a guard attached to the shank, and means as a set-screw for adjusting the guard to vary the interval between the same and the contiguous edged portion of the shank, the contiguous faces of the guard and shank being respectively convexed and concaved to fit the curvature of the disk, substantially as specified.

3. The herein-described knife for sharpening disks, the same comprising a shank provided at one end with a concave side surface and contiguous side cutting edges, a springguard permanentlj7 secured at one end to the shank and extending approximately parallel therewith to the extremity of the concaved` 

